/**
 * Update mapping blocks for specific links without prompting for all links.
 * Used when user changes specific links (single-link, selection-links, create-link).
 */

import { App, TFile } from "obsidian";
import type { MindnetSettings } from "../settings";
import { splitIntoSections, type NoteSection } from "./sectionParser";
import { parseEdgesFromCallouts } from "../parser/parseEdgesFromCallouts";
import {
  extractExistingMappings,
  removeWrapperBlock,
  type SectionMappingState,
} from "./mappingExtractor";
import {
  buildMappingBlock,
  insertMappingBlock,
  type MappingBuilderOptions,
} from "./mappingBuilder";
import { convertRelLinksToEdges } from "../parser/parseRelLinks";

/**
 * Update mapping blocks for sections containing rel: links, without prompting.
 * Only processes links that are already in [[rel:type|link]] format.
 */
export async function updateMappingBlocksForRelLinks(
  app: App,
  file: TFile,
  settings: MindnetSettings
): Promise<void> {
  let content = await app.vault.read(file);
  const lines = content.split(/\r?\n/);
  
  // Convert [[rel:type|link]] links to normal [[link]] and extract edge mappings
  const { convertedContent, edgeMappings: relLinkMappings } = convertRelLinksToEdges(content);
  content = convertedContent;
  
  if (relLinkMappings.size === 0) {
    // No rel: links to process
    return;
  }
  
  console.log(`[UpdateMappingBlocks] Converting ${relLinkMappings.size} rel: links to edge mappings`);
  
  // Split into sections
  const sections = splitIntoSections(content);
  
  // Process sections in reverse order (to preserve line indices when modifying)
  const modifiedSections: Array<{ section: NoteSection; newContent: string }> = [];
  
  for (const section of sections) {
    if (section.links.length === 0) {
      // No links, skip
      modifiedSections.push({
        section,
        newContent: section.content,
      });
      continue;
    }
    
    // Extract existing mappings
    const mappingState = extractExistingMappings(
      section.content,
      settings.mappingWrapperCalloutType,
      settings.mappingWrapperTitle
    );
    
    // Merge rel: link mappings (from [[rel:type|link]] format) into existing mappings
    // Key = Section-Link (mit #Abschnitt), damit Edge-Block >> [[Note#Abschnitt]] ausgibt
    for (const [linkBasename, edgeType] of relLinkMappings.entries()) {
      const matchingLink = section.links.find(
        link => link === linkBasename || (link.split("|")[0]?.trim() === linkBasename.split("|")[0]?.trim())
      );
      if (matchingLink !== undefined) {
        mappingState.existingMappings.set(matchingLink, edgeType);
        console.log(`[UpdateMappingBlocks] Updated rel: link mapping: ${matchingLink} -> ${edgeType}`);
      }
    }
    
    // Remove wrapper block if exists
    let sectionContentWithoutWrapper = section.content;
    if (mappingState.wrapperBlockStartLine !== null && mappingState.wrapperBlockEndLine !== null) {
      sectionContentWithoutWrapper = removeWrapperBlock(
        section.content,
        mappingState.wrapperBlockStartLine,
        mappingState.wrapperBlockEndLine
      );
    }
    
    // Build mapping block with updated mappings
    const mappingOptions: MappingBuilderOptions = {
      wrapperCalloutType: settings.mappingWrapperCalloutType,
      wrapperTitle: settings.mappingWrapperTitle,
      wrapperFolded: settings.mappingWrapperFolded,
      defaultEdgeType: settings.defaultEdgeType,
      assignUnmapped: "none", // Don't assign unmapped links, just use existing mappings
    };
    
    const mappingBlock = buildMappingBlock(
      section.links,
      mappingState.existingMappings,
      mappingOptions
    );
    
    if (mappingBlock) {
      const newContent = insertMappingBlock(sectionContentWithoutWrapper, mappingBlock);
      modifiedSections.push({
        section,
        newContent,
      });
    } else {
      // No mapping block needed
      modifiedSections.push({
        section,
        newContent: sectionContentWithoutWrapper,
      });
    }
  }
  
  // Reconstruct file content with modified sections
  let newContent = "";
  let currentLine = 0;
  
  for (let i = 0; i < modifiedSections.length; i++) {
    const { section, newContent: sectionNewContent } = modifiedSections[i]!;
    
    // Add lines before this section
    if (currentLine < section.startLine) {
      newContent += lines.slice(currentLine, section.startLine).join("\n");
      if (currentLine < section.startLine) {
        newContent += "\n";
      }
    }
    
    // Add modified section content
    newContent += sectionNewContent;
    
    currentLine = section.endLine;
    
    // Add newline between sections (except for last section)
    if (i < modifiedSections.length - 1) {
      newContent += "\n";
    }
  }
  
  // Add remaining lines after last section
  if (currentLine < lines.length) {
    newContent += "\n" + lines.slice(currentLine).join("\n");
  }
  
  // Write back to file
  await app.vault.modify(file, newContent);
  
  console.log(`[UpdateMappingBlocks] Updated mapping blocks for ${modifiedSections.length} sections`);
}